source4/smb_server/sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    handle SMBsessionsetup
   4    Copyright (C) Andrew Tridgell 1998-2001
   5    Copyright (C) Andrew Bartlett      2001
   6    Copyright (C) Jim McDonough        2002
   7    Copyright (C) Luke Howard          2003
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 /*
  27   setup the OS, Lanman and domain portions of a session setup reply
  28 */
  29 static void sesssetup_common_strings(struct smbsrv_request *req,
  30                                      char **os, char **lanman, char **domain)
  31 {
  32         (*os) = talloc_asprintf(req, "Unix");
  33         (*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
  34         (*domain) = talloc_asprintf(req, "%s", lp_workgroup());
  35 }
  36
  37
  38 /*
  39   handler for old style session setup
  40 */
  41 static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
  42 {
  43         NTSTATUS status;
  44         struct auth_usersupplied_info *user_info = NULL;
  45         struct auth_serversupplied_info *server_info = NULL;
  46         struct auth_session_info *session_info;
  47
  48         TALLOC_CTX *mem_ctx = talloc_init("NT1 session setup");
  49         char *remote_machine;
  50         if (!mem_ctx) {
  51                 return NT_STATUS_NO_MEMORY;
  52         }
  53
  54         if (!req->smb_conn->negotiate.done_sesssetup) {
  55                 req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
  56         }
  57
  58         remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
  59         status = make_user_info_for_reply_enc(&user_info,
  60                                               sess->old.in.user, sess->old.in.domain,
  61                                               remote_machine,
  62                                               sess->old.in.password,
  63                                               data_blob(NULL, 0));
  64         talloc_free(mem_ctx);
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 return NT_STATUS_ACCESS_DENIED;
  67         }
  68
  69         status = req->smb_conn->negotiate.auth_context->check_ntlm_password(req->smb_conn->negotiate.auth_context,
  70                                                                        user_info,
  71                                                                        &server_info);
  72         if (!NT_STATUS_IS_OK(status)) {
  73                 return nt_status_squash(status);
  74         }
  75
  76         status = make_session_info(server_info, &session_info);
  77         if (!NT_STATUS_IS_OK(status)) {
  78                 return nt_status_squash(status);
  79         }
  80
  81         sess->old.out.action = 0;
  82         sess->old.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
  83         if (sess->old.out.vuid == UID_FIELD_INVALID) {
  84                 return NT_STATUS_ACCESS_DENIED;
  85         }
  86         sesssetup_common_strings(req,
  87                                  &sess->old.out.os,
  88                                  &sess->old.out.lanman,
  89                                  &sess->old.out.domain);
  90
  91         req->session = smbsrv_session_find(req->smb_conn, sess->old.out.vuid);
  92
  93         return NT_STATUS_OK;
  94 }
  95
  96
  97 /*
  98   handler for NT1 style session setup
  99 */
 100 static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
 101 {
 102         NTSTATUS status;
 103         struct auth_usersupplied_info *user_info = NULL;
 104         struct auth_serversupplied_info *server_info = NULL;
 105         struct auth_session_info *session_info;
 106
 107         if (!req->smb_conn->negotiate.done_sesssetup) {
 108                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 109                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 110         }
 111
 112         if (req->smb_conn->negotiate.spnego_negotiated) {
 113                 struct auth_context *auth_context;
 114
 115                 if (sess->nt1.in.user && *sess->nt1.in.user) {
 116                         return NT_STATUS_ACCESS_DENIED;
 117                 } else {
 118                         make_user_info_guest(&user_info);
 119                 }
 120
 121                 status = make_auth_context_subsystem(&auth_context);
 122
 123                 if (!NT_STATUS_IS_OK(status)) {
 124                         return status;
 125                 }
 126
 127                 status = auth_context->check_ntlm_password(auth_context,
 128                                                            user_info,
 129                                                            &server_info);
 130
 131                 free_auth_context(&auth_context);
 132
 133         } else {
 134                 TALLOC_CTX *mem_ctx = talloc_init("NT1 session setup");
 135                 char *remote_machine;
 136                 if (!mem_ctx) {
 137                         return NT_STATUS_NO_MEMORY;
 138                 }
 139                 remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
 140                 status = make_user_info_for_reply_enc(&user_info,
 141                                                       sess->nt1.in.user, sess->nt1.in.domain,
 142                                                       remote_machine,
 143                                                       sess->nt1.in.password1,
 144                                                       sess->nt1.in.password2);
 145                 talloc_free(mem_ctx);
 146                 if (!NT_STATUS_IS_OK(status)) {
 147                         return NT_STATUS_ACCESS_DENIED;
 148                 }
 149
 150                 status = req->smb_conn->negotiate
 151                         .auth_context->check_ntlm_password(req->smb_conn->negotiate
 152                                                            .auth_context,
 153                                                            user_info,
 154                                                            &server_info);
 155         }
 156
 157         if (!NT_STATUS_IS_OK(status)) {
 158                 return nt_status_squash(status);
 159         }
 160
 161         status = make_session_info(server_info, &session_info);
 162         if (!NT_STATUS_IS_OK(status)) {
 163                 return nt_status_squash(status);
 164         }
 165
 166         sess->nt1.out.action = 0;
 167         sess->nt1.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
 168         if (sess->nt1.out.vuid == UID_FIELD_INVALID) {
 169                 return NT_STATUS_ACCESS_DENIED;
 170         }
 171         sesssetup_common_strings(req,
 172                                  &sess->nt1.out.os,
 173                                  &sess->nt1.out.lanman,
 174                                  &sess->nt1.out.domain);
 175
 176         req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
 177         if (session_info->server_info->guest) {
 178                 return NT_STATUS_OK;
 179         }
 180         if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
 181                 /* Already signing, or disabled */
 182                 return NT_STATUS_OK;
 183         }
 184
 185         /* Force check of the request packet, now we know the session key */
 186         req_signing_check_incoming(req);
 187
 188         srv_signing_restart(req->smb_conn,  &session_info->session_key, &sess->nt1.in.password2);
 189
 190         return NT_STATUS_OK;
 191 }
 192
 193
 194 /*
 195   handler for SPNEGO style session setup
 196 */
 197 static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
 198 {
 199         NTSTATUS status = NT_STATUS_ACCESS_DENIED;
 200         struct smbsrv_session *smb_sess;
 201         struct gensec_security *gensec_ctx = NULL;
 202         struct auth_session_info *session_info = NULL;
 203         uint16_t vuid;
 204
 205         if (!req->smb_conn->negotiate.done_sesssetup) {
 206                 req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
 207                 req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
 208         }
 209
 210         vuid = SVAL(req->in.hdr,HDR_UID);
 211         smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 212         if (smb_sess) {
 213                 if (!smb_sess->gensec_ctx) {
 214                         return NT_STATUS_INVALID_HANDLE;
 215                 }
 216
 217                 /* what is when the client is already successful authentificated? */
 218                 if (smb_sess->session_info) {
 219                         return NT_STATUS_ACCESS_DENIED;
 220                 }
 221
 222                 status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 223         } else {
 224                 status = gensec_server_start(&gensec_ctx);
 225                 if (!NT_STATUS_IS_OK(status)) {
 226                         DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
 227                         return status;
 228                 }
 229
 230                 gensec_want_feature(gensec_ctx, GENSEC_WANT_SESSION_KEY);
 231
 232                 status = gensec_start_mech_by_oid(gensec_ctx, OID_SPNEGO);
 233                 if (!NT_STATUS_IS_OK(status)) {
 234                         DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
 235                         return status;
 236                 }
 237
 238                 status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
 239
 240         }
 241
 242         if (!smb_sess) {
 243                 vuid = smbsrv_register_session(req->smb_conn, session_info, gensec_ctx);
 244                 if (vuid == UID_FIELD_INVALID) {
 245                         return NT_STATUS_ACCESS_DENIED;
 246                 }
 247                 smb_sess = smbsrv_session_find(req->smb_conn, vuid);
 248                 if (!smb_sess) {
 249                         return NT_STATUS_FOOBAR;
 250                 }
 251         }
 252
 253         if (NT_STATUS_IS_OK(status)) {
 254                 DATA_BLOB session_key;
 255
 256                 status = gensec_session_info(smb_sess->gensec_ctx, &smb_sess->session_info);
 257                 if (!NT_STATUS_IS_OK(status)) {
 258                         return status;
 259                 }
 260
 261                 status = gensec_session_key(smb_sess->gensec_ctx,
 262                                             &session_key);
 263                 if (NT_STATUS_IS_OK(status)
 264                     && !smb_sess->session_info->server_info->guest
 265                     && srv_setup_signing(req->smb_conn, &session_key, NULL)) {
 266                         /* Force check of the request packet, now we know the session key */
 267                         req_signing_check_incoming(req);
 268
 269                         srv_signing_restart(req->smb_conn, &session_key, NULL);
 270
 271                 }
 272         } else {
 273                 status = nt_status_squash(status);
 274                 if (smb_sess->gensec_ctx &&
 275                     !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 276                         gensec_end(&smb_sess->gensec_ctx);
 277                 }
 278         }
 279
 280         sess->spnego.out.action = 0;
 281         sess->spnego.out.vuid = vuid;
 282         sesssetup_common_strings(req,
 283                                  &sess->spnego.out.os,
 284                                  &sess->spnego.out.lanman,
 285                                  &sess->spnego.out.domain);
 286
 287         return status;
 288 }
 289
 290 /*
 291   backend for sessionsetup call - this takes all 3 variants of the call
 292 */
 293 NTSTATUS sesssetup_backend(struct smbsrv_request *req,
 294                            union smb_sesssetup *sess)
 295 {
 296         NTSTATUS status = NT_STATUS_INVALID_LEVEL;
 297
 298         switch (sess->generic.level) {
 299                 case RAW_SESSSETUP_GENERIC:
 300                         status = NT_STATUS_INVALID_LEVEL;
 301                         break;
 302                 case RAW_SESSSETUP_OLD:
 303                         status = sesssetup_old(req, sess);
 304                         break;
 305                 case RAW_SESSSETUP_NT1:
 306                         status = sesssetup_nt1(req, sess);
 307                         break;
 308                 case RAW_SESSSETUP_SPNEGO:
 309                         status = sesssetup_spnego(req, sess);
 310                         break;
 311         }
 312
 313         if (NT_STATUS_IS_OK(status)) {
 314                 req->smb_conn->negotiate.done_sesssetup = True;
 315         }
 316
 317         return status;
 318 }
 319
 320